Butterworth Tee LC High Pass Filter Calculator

Enter value, select unit and click on calculate. Result will be displayed.

Cutoff Frequency:
Impedance Z0:
Number of Components:
(1-11)
Capacitance: Inductance:
Unit : Unit :
C1: L1:
C2: L2:
C3: L3:
C4: L4:
C5: L5:
C6:  

A Butterworth Tee LC High-Pass Filter Calculator is a tool designed to help you create a Butterworth high-pass filter in a T-configuration using inductors (L) and capacitors (C). This type of filter allows high-frequency signals to pass through while attenuating low-frequency signals, and it's known for its maximally flat response in the passband — meaning no ripples in the frequency response.

How the T-configuration works:

T-shape layout: Two series capacitors (C1, C2) and one shunt inductor (L) connected between them.
Butterworth response: Ensures the smoothest possible transition from passband to stopband.
LC components:
Capacitors (C1, C2): Block low-frequency signals and pass high-frequency signals.
Inductor (L): Shunts low-frequency signals to the ground.
What the calculator does: You typically provide:

Cutoff frequency (Fc): The frequency below which signals start getting attenuated.
Load impedance (Z): The impedance of the load connected to the filter.
Filter order: The number of LC sections; a higher order means sharper cutoff.
The calculator then gives you the component values (L and C) needed to achieve the Butterworth response. For a 2nd-order high-pass filter: